#include <stdio.h>

/*求最大约数*/
void main()
{
    long i;
    int j;
    printf("Please input number:");
    scanf("%ld\n",&i);
    for(j=999;j>=100;j--)
    {
        if(i%j==0)
        {
            printf("The max factor with 3 digits in %ld is:%d.\n",i,j);
            break;

        }
    }

}
